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ATMEGA3250V-8AI 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
TQFP-100
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P2P6P62Hot
典型应用电路图在P191
原理图在P4P10P60P85P87P88P90P103P108P109P111P113
封装尺寸在P347P348P349
型号编码规则在P343P344P345P346P354
封装信息在P347
功能描述在P186
技术参数、封装参数在P60
应用领域在P33P41P50P53P54P251P255P265P266
电气规格在P60
导航目录
ATMEGA3250V-8AI数据手册
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6
2570N–AVR–05/11
ATmega325/3250/645/6450
2.2 Comparison between ATmega325, ATmega3250, ATmega645 and ATmega6450
The ATmega325, ATmega3250, ATmega645, and ATmega6450 differ only in memory sizes, pin
count and pinout. Table 2-1 on page 6 summarizes the different configurations for the four
devices.
2.3 Pin Descriptions
The following section describes the I/O-pin special functions.
2.3.1 V
CC
Digital supply voltage.
2.3.2 GND
Ground.
2.3.3 Port A (PA7..PA0)
Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port A output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port A pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port A pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
2.3.4 Port B (PB7..PB0)
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port B output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Port B has better driving capabilities than the other ports.
Port B also serves the functions of various special features of the Atmel
ATmega325/3250/645/6450 as listed on page 68.
2.3.5 Port C (PC7..PC0)
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port C output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Table 2-1. Configuration Summary
Device Flash EEPROM RAM
General Purpose
I/O Pins
ATmega325 32Kbytes 1Kbytes 2Kbytes 54
ATmega3250 32Kbytes 1Kbytes 2Kbytes 69
ATmega645 64Kbytes 2Kbytes 4Kbytes 54
ATmega6450 64Kbytes 2Kbytes 4Kbytes 69
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